Benefit Plans - Amounts Recorded in Consolidated Balance Sheets (Detail) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Defined Benefit Plan Disclosure [Line Items]
Non-current liabilities	$ (58.8)	$ (61.6)
Pension plans
Defined Benefit Plan Disclosure [Line Items]
Current liabilities	(5.9)	(6.2)
Non-current liabilities	(47.7)	(49.7)
Benefit obligations in excess of the fair value of plan assets	(53.6)	(55.9)
Other post-retirement plans
Defined Benefit Plan Disclosure [Line Items]
Current liabilities	(0.9)	(1.0)
Non-current liabilities	(5.4)	(5.6)
Benefit obligations in excess of the fair value of plan assets	$ (6.3)	$ (6.6)